Steve,
Simply delete all files in that folder. The system will automatically download files as necessary.
If you are intent on finding the culprit in that folder, you’ll need to spend some time testing. You could start by sorting the files by size and just removing the largest ones. Then try removing half of the files at a time, until you isolate the bad guy. If you do go through this effort, please let us know which file it was!
We’ve found it isn’t any of our pat files - we routinely have all of them downloaded for testing purposes. So it’s most likely a large pat file, probably from a paver manufacturer, or even a modified acad.pat file in there, just ruining your otherwise blissful day.
Have a good weekend!
—J